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. 2014 Jun 5;9(6):e98821. doi: 10.1371/journal.pone.0098821

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© 2014 Xing et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Equijubus normani (IVPP V12534). (B) Probactrosaurus gobiensis (PIN 2232/42-1). (C) Bactrosaurus johnsoni (AMNH 6553). (D) Parasaurolophus tubicen (NMMNH P-25100). (E) Edmontosaurus regalis (CMN 2289). (F) Brachylophosaurus canadensis (CMN 8893).